I started with 8x Rolls Surette S-550's which provided me with 24V/428AH Gross or 214AH Useable @ 50% DoD (Depth of Discharge).
The current selling price is $420ea X 8 = $3360.00 plus sales taxes etc...
I have now relegated that as my Secondary Battery Bank as I am now running with 1190AH LFP (LiFePO4) consisting of 3x 280AH & 2x175AH battery packs in Parallel within a Bank.
To make a 24V/280AH/7168Wh (7.16kWh), it requires the following:
8x 280AH LFP Cells ($1024 USD +500 S&H from Guesstimator) $1524 USD
1x 200A+ Capable BMS (Battery Management System) Average $250 USD
1x 200A Fuse Average $30 USD
1X Case/Box/Rack/Enclosure of your choice.
Estimated TOTAL $1804 USD Delivered to door.
NOTE:
24V/428AH Gross / 214AH Useable FLA Battery $3360
VS
24V/280AH Gross / 280AH Useable LFP Battery $1804
Supplier Used for this calculation link: * A Proper Quote requires a Chat/Messenger with Amy Wan of Luyuan Tech.
4pcs Eve 280ah Lifepo4 (lfp) 3.2v Cells Battery (new Version Lf280k With 6000cycles,Fully Matched)--genuine Grade A - Buy Eve lifepo4 luyuan Product on Alibaba.com
szluyuan.en.alibaba.com
Download this PDF Resource which explains what you need to do to assemble an LFP Battery Pack.
Luyuan Tech Basic Lifepo4 Assembly Guide
Some HANDY INFO TO KNOW:
- LFP does not age/wear like FLA/AGM. You can ADD Packs in Parallel as Funds Allow, even 6, 12 or 24 months later without concern for degradation like lead.
- LFP does not need Hydrogen Venting, No Watering or Maintenance either.
- A 24V/280AH 8S Battery Pack weighs approximately 90 Lbs (pending on casing etc)
- LFP can Discharge at 1C Rate meaning a 280AH Pack can output 280 Amps for One Hour.
- LFP can also Charge up to 0.5C Rate which is 140 Amps for Two Hours for a 280AH battery.
** SOME TERMS ARE SIMILAR ~ BUT ~ The context is slightly different, this requires a learning curve to adjust to Terminology as used. With Lithium Based Cells, we talk about SOC (State of Charge) versus DOD (Depth of Discharge)
- LFP does like to charge below 0C/32F (pending on chemistry variation) so these must be kept at "Human Tolerable Temps", preferably between 10C-30C / 50F-86F.
There are many commercial pre-builts such as BattleBorn (12V/100AH = $900 USD +/-)
Our shop offers everything you need to make the switch to lithium: batteries, components, chargers, and more.
battlebornbatteries.com
Or as Will has just Reviewed these:
24V 200AH LiFePower4 Battery by EG4 $1,499.00
OR you can go this route using 12V/100AH Battery Packs with 2 Batteries in Series for 24V "SETS" (Not the best option) and then with sets in Parallel to increase the available Amp Hours. Four of these in 2S2P would provide 24V/200AH Usable for $1400 USD
There is also AmpereTime & SOK prebuilts which Will has reviewed.
Hope it Helps, Good Luck.